require autoloader during test

Usually the autoloader is initialized fromt the DokuPDF constructor.
This is not called during individual ImageProcessor class tests.

rector and php sniffer cleanups

fix ImageProcessor test

The problem was that the test relied on the existence of a smiley image
that has recently be removed in master.

refactor the test classes

Note: the ImageProcessor test is currently broken (but was before).

Update test to include new link attribute data-wiki-id

no longer differentiate between natural and pageorder sorting

There is no reason not to always sort naturally.

mix pagenames and namespaces when sorting

As discussed in https://github.com/splitbrain/dokuwiki-plugin-dw2pdf/pull/399#issuecomment-624030852

properly sort pagenames by namespace. fixes #308

This ensures pages within the same namespace are put together, with the
start page being alwas first.

tests: fix class loading in tests

The DokuImageProcessorDecorator is now namespaced,

refactor: make getImage decorator testable and add tests

bookmarklevels may rise by 'only' +1

It seems that bookmarklevels in pdf should only increase by +1
Of course this creates a mismatch between actual levels and
bookmarklevels. This patch flattens th

bookmarklevels may rise by 'only' +1

It seems that bookmarklevels in pdf should only increase by +1
Of course this creates a mismatch between actual levels and
bookmarklevels. This patch flattens the nesting at the original level
were the mismatch started.

Fixes #218

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change export url parameters

pdftitle => book_title
pdfns_title => book_title
pdfns_ns => book_ns
pdfns_order => book_order
pdfns_depth => book_nsdepth
pdfbook_title => book_title

Temporary an fall

change export url parameters

pdftitle => book_title
pdfns_title => book_title
pdfns_ns => book_ns
pdfns_order => book_order
pdfns_depth => book_nsdepth
pdfbook_title => book_title

Temporary an fallback is left for: pdftitle and pdfbook_title
NOT for the pdfns_* parameters

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Also test renderer response

Output the link via internallink ()

Rename test file to conform with naming scheme

Add syntax to make export entire namespace easily